Amazon and Walmart Marketplace ask for the same core product facts, but they differ in who gets in, how strictly identifiers are enforced, and how your content is structured. If you prepare one clean catalog first, adapting it to the second marketplace is a matter of mapping fields, not rewriting everything.
For US brands, Amazon is the default marketplace and Walmart Marketplace is the most common second one. This comparison stays on the catalog side: what you need to get products listed correctly and matched to the right product page. Our Walmart Marketplace agency page describes the catalog and listing-data work we do there.
Who can sell on each marketplace?
Amazon is open to most sellers; Walmart screens applicants first. Amazon lets most sellers register and start listing, with extra approval for some categories and brands. Walmart Marketplace reviews seller applications before approving them, so access is more selective.
That affects your timeline more than your data. Start the Walmart application early and prepare the catalog while you wait, so listing is not delayed once you are approved.
How strict are product identifiers?
Both expect a product ID such as a UPC or GTIN for most items, and Walmart leans on them harder to match your item to its catalog. Amazon offers exemptions in some cases, such as private label products without barcodes. Official barcodes from GS1 avoid problems on both.
Walmart publishes a process for requesting a GTIN exemption in Seller Center. According to Walmart Marketplace Learn, you request it before creating items, as an admin, giving the category, product type, brand and a clear reason. A reason such as «your assortment does not have manufacturer-issued GTINs» is acceptable, while «you need an exemption to list items» is not. Walmart says review can take up to three business days, you must answer any request for information within five days, and after approval you wait four hours before creating the item with exactly the same brand name. If a request is denied, the options are to license a GS1 product ID or appeal.
The practical lesson is to decide which products need an exemption before you build listings, and to keep the brand name spelled identically everywhere.
How does listing content differ?
The fields are similar in spirit, but the containers differ.
| Element | Amazon | Walmart Marketplace |
|---|---|---|
| Title | Category-specific title rules | Category-specific title rules |
| Key features | Bullet points | Key features |
| Attributes | Category templates with required and optional fields | Category attributes in item setup |
| Brand content | A+ content for registered brands | Rich content options for brands |
Check each category’s current rules inside the seller account before you write copy. Limits and required fields vary by category and change over time, so we do not quote character counts here.
Why does product matching matter so much?
Both marketplaces try to match your item to an existing product page, and a wrong match is expensive. If your identifiers or attributes do not match, your offer can end up on the wrong page or create a duplicate. Clean, consistent data avoids that.
What do you check before you list on either one?
Run a short audit against this table. It shows what to check, why it matters and what good looks like.
| Check | Why it matters | What good looks like | Common mistake |
|---|---|---|---|
| GTIN on every branded item | Used to match your item to the catalog | Valid, from the manufacturer or GS1, one per variant | Reusing one code across variants |
| Brand name | Matching and exemption approvals depend on it | Identical spelling in every system and listing | «Acme», «ACME Inc.» and «Acme Co» in different places |
| Variant structure | Decides whether sizes and colors group correctly | One parent, clear variant attributes | Each size listed as a separate unrelated product |
| Required category attributes | Missing ones block or weaken the listing | Filled from the product data, not guessed | Placeholder values to pass validation |
| Price and stock source | Mismatch with your site hurts trust | One source, scheduled sync | Manual updates after a sale |
| Product images and facts | Shoppers and assistants compare listing to reality | Same dimensions, materials and contents as the product page | Marketing copy that overstates specs |
Where do AI assistants come in?
Both marketplaces are connecting their catalogs to AI shopping, so catalog quality now affects more than the product page. Amazon renamed its shopping assistant Alexa for Shopping in May 2026. Walmart has its own assistant, Sparky, and has worked with AI platforms such as ChatGPT.
Walmart was reported in March 2026 to find that in-chat checkout converted worse than sending shoppers to its site, which says a lot about where AI shopping is today; see Discover in AI, buy on your site. For stores, the useful conclusion is modest: complete, consistent data helps in every one of these surfaces. We cannot promise that a listing will appear in any assistant’s answer.
What does a hypothetical migration look like?
Imagine a brand with a few thousand SKUs already listed on Amazon, adding Walmart Marketplace. The easy move is to export the Amazon listings and upload them. The better move is to go back to the source catalog.
In this example the Amazon titles have been rewritten many times to fit category rules, and the bullet points carry promotional claims. Copying them to Walmart would spread those problems. Instead, we would rebuild from the master data: identity, identifiers, attributes, price and stock, then write the Walmart key features and category attributes from those facts. Products without manufacturer GTINs are grouped by brand and product type so the exemption request, if needed, is clear and accurate. The scenario is invented and the numbers are not real; the method is what carries over.
What mistakes cause duplicates and rejected listings?
| Mistake | Symptom | Fix |
|---|---|---|
| Uploading Amazon listings straight to Walmart | Rejected or weak listings in categories with different attributes | Rebuild from the master catalog |
| Inconsistent brand names | Failed item creation after an approved exemption, or items on the wrong page | One brand spelling, everywhere |
| Invented or shared barcodes | Items matched to another seller’s product | Use valid GTINs or follow the exemption process |
| Unclear variants | Colors and sizes scattered across several pages | Define parent and child structure first |
| Different price rules per channel without a plan | Customers see a lower price elsewhere | Decide pricing policy before you list |
When is adding the second marketplace not worth it?
If your catalog data is still inconsistent on the first marketplace, fix that first. Also hold off if you cannot keep stock current across channels, since overselling is a problem on any marketplace, or if your products depend on exclusive distribution terms that restrict where they can be sold. Check those terms with your suppliers.
What should you ask before you start?
- Which of our products have manufacturer GTINs, and which do not?
- Who owns the master catalog, and where is brand spelling defined?
- Are we applying to Walmart now, so the application does not hold up the listing work?
- Which categories do we sell in, and have we read their current attribute rules?
- How will price and stock stay in sync across the site and both marketplaces?
One catalog for both
The core data is the same: identity, identifiers, attributes, price and stock. Build it once and adapt it to each marketplace’s format. Our guide to one product feed for every AI channel explains the structure, and the product data AI shopping agents read lists the fields that matter. To add TikTok Shop to the comparison, read TikTok Shop vs Amazon vs Walmart.
How Avafa works
We prepare and maintain the catalog data behind these channels, starting from Google Merchant Center. Learn more on our Google Merchant Center agency page and our Amazon catalog work page. Our marketplace work covers catalog, feed and listing data only: we do not run advertising, manage ad spend or sell on your behalf. We are a consultancy based in Spain, working remotely.
FAQs
Can I use the same product content on Amazon and Walmart?
The core data, yes. Titles, features and attributes need adapting to each marketplace’s category rules, so avoid pasting listings across.
Do I need GTINs for Walmart?
For most items, yes, because Walmart uses product identifiers to match items to its catalog. If your assortment has no manufacturer-issued GTINs, Walmart has a GTIN exemption request process in Seller Center.
How long does a Walmart GTIN exemption take?
According to Walmart Marketplace Learn, review can take up to three business days, and you must answer any request for information within five days. Check the current guide before you apply.
Which marketplace should I do first?
Most US brands start with Amazon because access is broader, then add Walmart. If your products suit Walmart’s shoppers, the order can change, as long as the catalog is clean.
Will good catalog data get me into AI shopping assistants?
It helps, because assistants read structured product data, but nobody can guarantee appearing in an answer.
